The anterior interosseous nerve branches from the median nerve beneath or distal to the pronator teres muscle. Neurologic symptoms may arise if it is compressed or entrapped in the forearm. Identifying the cause can help determine if and how to manage the neuropathy.


Conditions that can affect the anterior interosseous nerve:

(1) blunt or penetrating trauma, including compression

(2) surgery

(3) pressure from a forearm cast

(4) venipuncture or injection

(5) lipoma or other soft tissue tumor

(6) benign cyst

(7) vascular lesion

(8) accessory (congenital) muscle

(9) an enlarged tendon at the origin of the ulnar head of the pronator teres muscle

(10) fibrous band arising from the superficial flexor

(11) diffuse scarring or fibrosis in the forearm


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